The SPIRou wavelength calibration for precise radial velocities in the near infrared

M. Hobson , F. Bouchy , N. Cook , E. Artigau , C. Moutou (1) , I. Boisse , C. Lovis , A. Carmona , X. Delfosse , J.-F. Donati (1)

1 IRAP - Institut de recherche en astrophysique et planétologie

Aims. SPIRou is a near-infrared (nIR) spectropolarimeter at the CFHT, covering the YJHK nIR spectral bands (980−2350 nm). We describe the development and current status of the SPIRou wavelength calibration in order to obtain precise radial velocities (RVs) in the nIR. Methods. We make use of a UNe hollow-cathode lamp and a Fabry-Pérot étalon to calibrate the pixel-wavelength correspondence for SPIRou. Different methods are developed for identifying the hollow-cathode lines, for calibrating the wavelength dependence of the Fabry-Pérot cavity width, and for combining the two calibrators. Results. The hollow-cathode spectra alone do not provide a sufficiently accurate wavelength solution to meet the design requirements of an internal error of < 0.45 m s −1 , for an overall RV precision of 1 m s −1 . However, the combination with the Fabry-Pérot spectra allows for significant improvements, leading to an internal error of ∼0.15 m s −1 . We examine the inter-night stability, intra-night stability, and impact on the stellar RVs of the wavelength solution.

Domaines: Planète et Univers [physics]

M. Hobson, F. Bouchy, N. Cook, E. Artigau, C. Moutou, et al.. The SPIRou wavelength calibration for precise radial velocities in the near infrared. Astronomy and Astrophysics - A&A, 2021, 648, pp.A48. ⟨10.1051/0004-6361/202038413⟩. ⟨hal-03194932v1⟩